213406 has 4 divisors (see below), whose sum is σ = 320112. Its totient is φ = 106702.

The previous prime is 213397. The next prime is 213407. The reversal of 213406 is 604312.

213406 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 213406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53350 + ... + 53353.

It is an arithmetic number, because the mean of its divisors is an integer number (80028).

2²¹³⁴⁰⁶ is an apocalyptic number.

213406 is a deficient number, since it is larger than the sum of its proper divisors (106706).

213406 is a wasteful number, since it uses less digits than its factorization.

213406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106705.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 213406 is about 461.9588726283. The cubic root of 213406 is about 59.7588468661.

Adding to 213406 its reverse (604312), we get a palindrome (817718).

The spelling of 213406 in words is "two hundred thirteen thousand, four hundred six".